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Question by jpothoof · Sep 07, 2020 at 02:14 AM · c#game

How to create a reflective shield for my 2D platformer character?

Hi all, as the tile suggests, I'm trying to write a script that will make my character cause enemies to reflect off of them i.e. flip their velocity when they collide. I want to to be an ability if the player holds down the mouse button. There is another answer from 2011: https://answers.unity.com/questions/168454/creating-a-shield.html but it's written in Java and I barely even understand C#! I'll attach the script that I have below.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class ReflectShield : MonoBehaviour
 {
     public float reflectivePower;
     private bool active;
 
     // Update is called once per frame
     void Update()
     {
         if(Input.GetMouseButtonDown(0)) {
             active = true;
         }
 
     }
     void OnCollisionEnter2D(Collision2D collision) {
         if(active) {
             if (collision.gameObject.CompareTag("Enemy")) {
                 Vector2 dir = collision.gameObject.GetComponent<Rigidbody>().velocity;
                 dir = -dir;
                 collision.gameObject.GetComponent<Rigidbody>().velocity = dir * reflectivePower;
             }
         }
     }
 }





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Answer by streeetwalker · Sep 07, 2020 at 06:56 AM

HI @jpothoof, all you need to do is take the negative of the current velocity and apply it. That is what the code is doing, and it should work (if reflectivePower == 1 then it will be a perfectly elastic "bounce").

So where is the problem?

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